pwm: clps711x: Drop driver local locking

The pwm core serializes calls to .apply(), so the spinlock adds no
additional protection. Disabling the irq is also irrelevant as the driver
isn't an atomic one and so the callbacks cannot be called from atomic
context.

Signed-off-by: Uwe Kleine-König <u.kleine-koenig@baylibre.com>
Link: https://lore.kernel.org/r/d4931dc0c0d657d80722cfe7d97cb4fb4ccec90e.1750788649.git.u.kleine-koenig@baylibre.com


Signed-off-by: Uwe Kleine-König <ukleinek@kernel.org>